Low energy quasiparticle excitation in the vortex state of borocarbide superconductor yni2b2c.

作者: K. Izawa , A. Shibata , Yuji Matsuda , Y. Kato , H. Takeya

DOI: 10.1103/PHYSREVLETT.86.1327

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摘要: We measured the heat capacity ${C}_{p}$ and microwave surface impedance ${Z}_{s}$ in vortex state of ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$. In contrast to conventional $s$-wave superconductors, shows a $\sqrt{H}$ dependence. This dependence persists even after introduction columnar defects which change electronic structure core regime destroy regular lattice. On other hand, flux flow resistivity is nearly proportional $H$. These results indicate that ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ fundamentally different from counterparts, delocalized quasiparticle states around are important, similar $d$-wave superconductors.

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